Optimization of wheat straw co-composting for carrier material development

[Display omitted] •128 days-composting was technically feasible to obtain a highly modified material.•A statistical procedure to optimize a co-composting process was developed.•Combination of Fungi, N and grinding improved composting to produce carrier material.•Modified wheat straw showed high WHC...

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Bibliographic Details
Published in:Waste management (Elmsford) 2019-10, Vol.98, p.37-49
Main Authors: Calabi-Floody, Marcela, Medina, Jorge, Suazo, Jonathan, Ordiqueo, Manuel, Aponte, Humberto, Mora, María de La Luz, Rumpel, Cornelia
Format: Article
Language:English
Subjects:
Agriculture
Carrier material
Co-composting
Composting
Environmental Sciences
Fertilizers
Life Sciences
Multiple response optimization
Optimization
Smart fertilizer
Soil
Triticum
Wheat straw
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Summary:[Display omitted] •128 days-composting was technically feasible to obtain a highly modified material.•A statistical procedure to optimize a co-composting process was developed.•Combination of Fungi, N and grinding improved composting to produce carrier material.•Modified wheat straw showed high WHC and carbon stabilization (C:N ratio). In modern agriculture large amounts of harvesting residues are produced each year due to the increase of agricultural activities in order to maintain food production for the growing population. The development of innovative fertilizers, able to satisfy nutrient needs without adverse effects on the environment. In order to allow for effective production of a carrier material for smart fertilizers, the objective of this study is to propose a statistical method to optimize the water holding capacity (WHC) and organic matter stability properties of co-composted wheat straw (WS) by using a multi response method. We varied WS size (2 cm), charge of Trichoderma harzianum (0, 7 and 14 discs), and nitrogen addition (0, 0.95 and 1.95 g kg−1). Optimized carrier material was characterized by a higher porosity (WHC 91.7%) than raw WS, associated to structural changes and slightly increased stability as indicated by C:N ratio of the 59.5, slightly alkaline (pH ∼ 8.0), with high OM structural complexity (E4:E6 ∼ 7,9) and enhanced sorption properties (total acidity ∼ 11.6). We conclude that the optimal treatment included co-composting of WS with fine particle size (
ISSN:0956-053X
1879-2456
DOI:10.1016/j.wasman.2019.07.041